B0968

DTC B0968

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B0968 00
- Parking Aid Indicator Circuit

Circuit/System Description

The object alarm detection system senses how close the vehicle is to an object. The distance is determined by the 4 ultrasonic sensors located in the rear bumper. The object detection system will notify the driver when backing up at speeds less than 8 km/h (5 mph), which make parking easier and helps you avoid colliding with objects such as parked vehicles.

Each object sensor is a 3-wire sensor that is both a transmitter and a receiver that comprises a signal circuit, a low reference circuit, and an 8-volt supply voltage circuit. The rear object control module supplies 8 volts to the object sensors via the object sensor supply voltage circuit and provides ground via the low reference circuit. The rear object control module triggers the sensors in a sequential loop and after each sensor transmits, the rear object control module uses the echo or signal return to calculate the distance and position of an object from the rear bumper. The rear object control module directly controls the rear parking assist (RPA) display. The RPA consists of 2 amber and one red LED that indicate the range of an object from the rear bumper. The rear object control module will also use an audible warning by sending a low speed GMLAN message to the radio.

Conditions for Running the DTC

Ignition voltage is between 9-16 volts.

Conditions for Setting the DTC

The following condition must exist for 300 milliseconds:

The object alarm module has detected that one of the three indicator control circuits for the rear display is determined to be open or shorted.

Action Taken When the DTC Sets

* The object alarm module commands ON the telltale assembly information center red indicator and disables the object detection system.
* The object alarm module will send a serial data message to the instrument panel cluster (IPC) to display SERVICE PARK ASSIST message in the driver information center (DIC) and a chime will sound from the radio speakers.

Circuit/System Verification

The red indicator displays continuously in the rear or front telltale assembly information center. If red indicator is not flashing, check if DTC is history.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the telltale assembly information center.
2. Ignition ON, place the transmission in reverse. Verify a test lamp illuminates when connected between the supply voltage circuit terminal A and ground.

• If the test lamp does not illuminate, test the supply voltage circuit for a short to ground or an open/high resistance.

3. Ignition ON, scan tool installed, place the transmission in reverse. Verify that a test lamp illuminates when connected between the supply voltage circuit terminal A and each indicator control circuit terminals B, C, and D while performing the scan tool special functions LED test.

• If the test lamp does not illuminate for one or more indicator control circuits, test the suspect indicator control circuit for a short to ground or an open/high resistance. If all the circuit(s) test normal, replace the telltale assembly information center.

4. If all circuits test normal, test or replace the object alarm module.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Programming and Relearning for object alarm module setup, and programming. Programming and Relearning